Nickel Composite Pore Structure for High-Efficiency Cathode Materials
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Solution Overview
Problem
Existing lithium secondary batteries face challenges in achieving high initial charge and discharge efficiency, necessitating improvements in the physical properties of the metal composite compounds used as raw materials for positive electrode active materials.
Innovation Solution
A metal composite compound with specific pore volume distribution characteristics, including A/B ratio, multiple maximum points in certain pore diameter ranges, and compositional formula Ni(1-x-y)M1xM2yOz(OH)2-α, is used to produce a positive electrode active material through calcination with a lithium compound, ensuring uniform penetration and reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal composite compounds are used as raw materials for positive electrode active materials, then the production process is simple, but the initial charge and discharge efficiency of the lithium secondary battery is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pore diameter distribution parameters (A/B ratio between 0.05 and 1.5) of the metal composite compound. By adjusting these physical parameters of the raw material, the initial charge and discharge efficiency is improved without fundamentally changing the production process complexity.
Solution Approach 2:
The patent utilizes porous materials by designing the metal composite compound with a specific pore structure characterized by controlled pore diameter distribution. The porous structure with optimized A/B ratio enables better lithium ion diffusion and reaction efficiency, thereby improving initial charge and discharge efficiency while maintaining manufacturing feasibility.
2Manufacturing precision
If the pore diameter distribution of metal composite compound is not controlled, then the manufacturing process is simple, but the uniformity of lithium distribution in the positive electrode active material is poor
Solution Approach 1:
The patent applies parameter changes by defining specific ranges for pore diameter distribution parameters (A/B ratio between 0.05 and 1.5). By controlling these parameters, uniform lithium distribution is achieved during calcination without requiring complex additional manufacturing steps.
Solution Approach 2:
The patent applies preliminary action by pre-controlling the pore structure of the metal composite compound before calcination. The predetermined pore diameter distribution ensures that lithium compounds can uniformly penetrate and react during the subsequent calcination process, achieving uniform lithium distribution without requiring complex in-process adjustments.
3Productivity
If the pore structure of metal composite compound is optimized for better lithium diffusion, then the initial charge and discharge efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by specifying concrete numerical ranges for pore structure parameters (A/B ratio between 0.05 and 1.5). These parameter specifications enable manufacturers to control pore structure using existing technologies without requiring fundamentally new manufacturing equipment or processes.
Solution Approach 2:
The patent utilizes porous materials with optimized pore diameter distribution to enhance lithium ion diffusion and reaction efficiency. The porous structure is achieved through control of the metal composite compound synthesis process, improving productivity while maintaining manufacturing feasibility through parameter optimization rather than structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in a lithium secondary battery with enhanced initial charge and discharge efficiency by facilitating uniform distribution of lithium within the particles, thereby increasing capacity and efficiency.
Implementation Method 1
a step of calcining a mixture of the metal composite compound according to any one of [1] to (7) and a lithium compound
Implementation Method 2
when a differential pore volume distribution is determined by a Barrett Joyner-Halenda method from a nitrogen gas adsorption isotherm
Data Source
AI summary
A metal composite compound is provided with which a lithium secondary battery having high initial charge and discharge efficiency can be produced. A metal composite compound containing at least Ni, in which in the metal composite compound, when in a differential pore volume distribution determined by a Barrett-Joyner-Halenda method from a nitrogen gas adsorption isotherm, an integrated area of a region where a pore diameter is 1 nm or more and 50 nm or less is A, and an integrated area of a region where the pore diameter is more than 50 nm and 200 nm or less is B, A/B is 0.05 or more and less than 1.5.